Numerical Simulation of Supernova-Relevant Laser-Driven Rayleigh-Taylor Experiments on OMEGA

Details Numerical Simulation of Supernova-Relevant Laser-Driven Rayleigh-Taylor Experiments on OMEGA Numerical Simulation of Supernova-Relevant Laser-Driven Rayleigh-Taylor Experiments on OMEGA

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dppbo2014m&link_type=abstract

American Physical Society, 44th Annual Meeting of the Division of Plasma , abstract #BO2.014

Physics

Scientific paper

In ongoing experiments performed on the OMEGA laser at the University of Rochester Laboratory for Laser Energetics (LLE), nanosecond laser pulses are used to drive strong shocks into two-layer (polyimide / carbon foam) targets with density ratio 1.42:0.1. Perturbations on the interface between the two materials are unstable to the Rayleigh-Taylor instability during the deceleration-phase behind the shock front. The parameters of these experiments are chosen such that the hydrodynamics scales up to the characteristic length and time scales of core-collapse supernovae such as SN 1987A. The ultimate goal of this research is to develop an understanding of the effect of hydrodynamic instabilities on supernovae observables that remain as yet unexplained. We are, at present, particularly interested in the development of the Rayleigh-Taylor instability through the late nonlinear stage and in the transition to turbulence. In this talk, we present the results of numerical simulations of the experiments. These simulations are run at Lawrence Livermore National Laboratory using the Arbitrary Lagrangian Eulerian (ALE) code CALE and the adaptive mesh refinement (AMR) code RAPTOR. CALE is a 2D hydrodynamics code, while RAPTOR can be run in either 2 or 3D. We begin with the simplest case ? that of single mode perturbations in 2D, and then move on to 2D multimode perturbations and, finally, to single and multimode perturbations in 3D. Simulation results are compared with experiment and, where possible, with models. This work was performed under the auspices of the U. S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48.

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